I dig the black on white. Reminds me of some earlier DOS games like Ultima, or I guess for a more contemporary example Undertale. I think that could be a thing you could try to go for here, a black and white super early computer game art style. Use the detailed sprite as an opener and go into full  retro land. It will also make the job of making sprite variations a lot easier. The moments when she changes her pose are nice, but they're quite rare, less work per pose means lots more poses.

I liked the action writing and how using the same command twice produced different results. You could probably hide a command buttons when all the text variations for it are exhausted. I would like to see more branching paths as far as the interactivity is concerned, maybe even some character stats that change based on what you do.

I think there's a good bit of potential here, keep working on it!

Play: You click buttons to talk to and interact with her, and unlock more buttons you can click. It's a visual novel with an RPG coat of paint, which fits well with the general theme.

Aesthetic: There's only a few graphics, but they look pretty good. Obviously, most of the time was spent on the Slime Queen's sprites, and she's very well-done- if/when you update the game, maybe consider putting her in an environment that seems a little more suited? The hallway setting is reminiscent of classic adventure games, but she might be more at home in a fun slimey throne room or something.

Sound: I really like the music! I think there's also a very subtle text-typing sound? I might be imagining it, but if it's really there, good job with that.

Narrative: There is a straightforward narrative that can be understood without any supplementary reading, and it makes sense. Better than my entry lol

Horny: It's a sex encounter simulator, so full marks here.

Kink: Regarding the game page, I didn't know that slime and tentacles were in the same sort of category, although it makes sense now that I think of it. Also, I like that you took specific care to depict everything as consensual, from what I've seen it's a real problem in that genre so I appreciate the good vibes here.

Stealth: It's not that kind of game, and that's fine.

Harmony and Novelty: It's a 'click and read' sort of game- relying on a solid formula means you're not breaking new ground. These two categories tend to be the inverse of each other up to a certain point, imo.

Final Thoughts: Interesting that this was made with RPGMaker. I definitely would have gone with Ren'py or something else specifically made for visual novels, I'm interested to hear a bit about what making this was like :0 I guess the 'full version' you tease at would have, like, walking around and stuff? Interesting premise.